programmatic matching -- doc question

[funderburkjim]

This question based on the 'sheep' example:

sheep = acceptor("b") + acceptor("a").plus
sheep.optimize(True)

Is there an 'official' programmatic way to test whether a given string 's' matches the 'regular expression' specified by 'sheep'? By trial and error, my candidate expression is:

compose(s,sheep).num_states() != 0

[kylebgorman]

Good question. That one works just fine. An even more general version, which works with the lower level pywrapfst layer, is:

compose(s, sheep).start() == NO_STATE_ID

The built-in function matches is a two-argument function that does exactly this.

Also just FYI, you can pass a string in place of an acceptor and Pynini will implicitly compile it into an acceptor for you.

On Fri, Aug 3, 2018, 4:33 PM funderburkjim notifications@github.com wrote:

This question based on the 'sheep' example:

sheep = acceptor("b") + acceptor("a").plus sheep.optimize(True)

Is there an 'official' programmatic way to test whether a given string 's' matches the 'regular expression' specified by 'sheep'? By trial and error, my candidate expression is:

compose(s,sheep).num_states() != 0

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[taufique74]

What would be the appropriate matches() function for version >= 2.1.3 ? I'm currently using the python.lib.rewrite.matches() function this way

from pynini.lib.rewrite import matches

fst = pynini.accep('abc')

input_string = 'abc '
matches(input_string, input_string, fst) # True

input_string = 'abcd '
matches(input_string, input_string, fst) # False

Does this look okay?

[kylebgorman]

I think you want:

matches(input_string, input_string, fst)

The rule is supposed to be the third argument.

On Sat, May 1, 2021 at 12:48 PM Taufiquzzaman Peyash < @.***> wrote:

What would be the appropriate match() function for version >= 2.1.3 ? I'm currently using the python.lib.rewrite.matches() function this way

from pynini.lib.rewrite import matches fst = pynini.accep('abc') input_string = 'abc 'matches(input_string, fst, input_string) # True input_string = 'abcd 'matches(input_string, fst, input_string) # False

Does this look okay?

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[taufique74]

Yeah, you're right! My bad! Thanks so much for the clarification.